NGC 1499 California nebula (Alberto Tomatis)

NGC 1499 California nebula

La Nebulosa California (anche nota come NGC 1499) è una nebulosa ad emissione visibile nella costellazione di Perseo.

Fu scoperta da Edward Emerson Barnard nel 1884 ed è stata battezzata così perché la sua forma, che ritratta nelle fotografie a lunga esposizione,ricorda lo Stato statunitense della California.

Si osserva nella parte meridionale della costellazione. La sua distanza è stimata sui circa 1.000 anni luce dalla Terra.

È lunga circa 2,5° e sotto un cielo molto scuro, la si può solo intravedere ad occhio nudo. A causa della sua bassa luminosità superficiale, non è molto più facile osservandola visivamente in un telescopio. Invece,è un bersaglio ideale per astrofotografi.

NGC 1499 è probabilmente illuminata da Xi Persei, una calda stella bianco-azzurra di sequenza principale di tipo spettrale O7e.

Questa stella appartiene ad un'associazione di giovani stelle probabilmente nate da questa nube interstellare, Perseo OB2.

è la stella più calda di questa associazione. Situata a 0,6 s gradi della Nebulosa California è la stella più brillante di Perseo OB2, Zeta Persei, una B1 Ib supergigante bianca che brilla di magnitudine 2.83.

Alla distanza di circa 1000 anni luce da noi, il che corrisponde alla luminosità di 6300 soli o ad una magnitudine assoluta di -4,7.

Questa stella ha un moto proprio annuale di 0,02 "il che significa che si sta allontanando da noi a circa 20 km / s.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape
Artificial satellite

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

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